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About Jan Shim, MD

Dr. Shim strives to provide her patients with the very best care in digestive diseases and gastrointestinal endoscopy. Her mission is to deliver compassionate, high quality, and comprehensive care through an unparalleled patient experience.

Dr. Shim provides compassionate and reliable care to all of her patients. She prioritizes delivering quality care and cutting-edge treatments. She is on staff at both Westside GI LLC and Hudson in New York, NY, and Hudson Crossing ASC in Fort Lee, NJ.



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Colonoscopy

A colonoscopy is now the gold standard used to detect or prevent individuals from getting colon cancer. Adults starting at age 45 years are strongly recommended to have a colonoscopy or some other test to screen for colon cancer.

Capsule Endoscopy

During the procedure, a patient swallows a vitamin-sized pill with a camera inside (pill camera). Transported smoothly and painlessly through the GI tract by the body’s own natural peristalsis, the video pill capsule transmits images of different parts of your intestine, such as the small intestine and the esophagus.

ERCP

An endoscopic retrograde cholangiopancreatography, more commonly known as ERCP, is an endoscopic procedure that is also combined with X-rays. ERCP is very much like a typical upper GI endoscopy; however, your gastroenterologist will inject a dye during the procedure, which highlights problems in certain digestive organs through X-ray technology.

Flexible Sigmoidoscopy

A sigmoidoscopy is an internal exam of the lower part of the large intestine (colon) using a short, thin, flexible, lighted tube with a camera at the tip. This procedure helps determine the cause of abdominal pain, rectal bleeding, changes in bowel habits, chronic diarrhea, and other intestinal problems.

Hemorrhoid Treatments

Two of the most common treatments for hemorrhoid removal are hemorrhoid banding, which cuts off blood flow to the hemorrhoid, and infrared coagulation (IRC) therapy, which uses infrared light to shrink and shrivel hemorrhoids. The treatment method depends highly upon whether the hemorrhoids are external (around the anus) or internal (in the rectum).

Upper Endoscopy

An endoscopy is a very common and safe procedure that is used to examine the esophagus, stomach, and upper part of the small intestine, known as the duodenum, to get a closer look at what may be causing symptoms.

Celiac Disease

Celiac disease is an autoimmune disease where a patient’s immune system abnormally responds to the ingestion of gluten. It is estimated that 1 in 100 people worldwide is affected by celiac disease. However, up to 2.5 million people in the United States may have celiac disease and not know it, as the symptoms range from mild to severe.

Constipation

Constipation is defined as having a bowel movement fewer than three times per week. With constipation, stools are usually hard, dry, small in size, and difficult to eliminate. Some people who are constipated find it painful to have a bowel movement and often experience straining, bloating, and the sensation of a full bowel.

GERD

Gastroesophageal reflux disease (GERD) is a more serious form of gastroesophageal reflux (GER) which is common. GER occurs when the lower esophageal sphincter (LES) opens spontaneously, for varying periods of time, or does not close properly, and stomach contents rise up into the esophagus.

Hemorrhoids

Hemorrhoids are swollen veins in the anal canal. This common problem can be painful and can be caused by too much pressure on the veins in the pelvic rectal area. Normally, tissue inside the anus fills with blood to help control bowel movements, but if you strain or sit on the toilet a long time to move stool, the increased pressure causes the veins in this tissue to swell and stretch.

Inflammatory Bowel Disease + Crohn's Disease & Ulcerative Colitis

Inflammatory bowel disease (IBD) encompasses a set of gastrointestinal diseases where parts of the digestive tract are chronically inflamed by a dysfunctional interaction immune system. Hereditary factors and an abnormal interaction between microorganisms and the immune system are felt to play a role.

Irritable Bowel Syndrome

It is estimated that 10 to 15 percent of Americans have Irritable Bowel Syndrome (IBS). IBS is a functional GI disorder that refers to a group of symptoms that affect the digestive tract, often resulting in abdominal pain, bloating, or cramping. However, some people with IBS have no symptoms at all.

What Our Patients Say About Dr. Shim

Dr.Shim takes her time with each patient and asks thorough questions. She listens to you and is thorough in her testing to find out what is causing your ailment.
Tony T.
Tony T.
Dr.Shim and her staff are wonderful. Everyone is friendly, knowledgeable, and most importantly experienced. From my experience of booking appointments, to leaving one of his offices after exam day, each moment was professional and I did not have to wait a long time for any of it.
Alec S.
Alec S.
Dr.Shim is a very professional, caring and knowledgeable doctor. She is very kind and takes the time to listen to all my concerns, answer all of my questions regarding my health issues and explains things carefully. I recommend Dr. Shim as a wonderful doctor, who truly cares about his patients and ensures that your health issues are a top priority.
Judi C.
Judi C.
My experience with Dr. Shim is always pleasant and productive. I discuss whatever my health issues are at the time of the visit and she is very helpful and advises me on the best solution to help my problem at the time of the visit.
Mary C.
Mary C.
Dr. Shim was very thorough reading all my medical records and was very knowledgeable about my symptoms. I was very satisfied with the results she gave me from the exam. I would definitely recommend Dr Shim to all my friends and family.
Louis A.
Louis A.
Dr. Shim has a professional work ethic. She is kind and handles her patients with care. She keeps up with the state of your health during each visit and listens to what you have to say. She gives you all the information you need to be sure you are in good health. I highly recommend Dr. Shim.
Shawn M.
Shawn M.
It was an absolute pleasure being treated by Dr. Shim. Knowledgeable, informative, and caring. Office staff was attentive and a pleasure to interact with.
Chelsea R.
Patient Testimonials
Dr. Shim is by far one of my favorite doctors, she takes the time to explain everything to you. I have never felt more at ease with a doctor and never rushed. The staff are always friendly. Alway on time for your appointment never had to wait.
Rick R.
Patient Testimonials
I received more time, explanation, education and attention from this office than any physician office I have ever been to. Dr. Shim was great. She was recommended to me and I would recommend her to anyone and everyone I know.
Frank L.
Patient Testimonials
Dr. Shim is a wonderful physician. She is very thorough and will also take the time to explain procedures and answer questions. Her bedside manner is reassuring and she is easy to discuss concerns with.
Donna H.
Patient Testimonials
Dr. Shim has to be one of the kindest doctors I have ever met. She really cares about her patients, even brand-new ones like myself, having just met with her for the first time. Dr. Shim takes the time to get to know you, your medical history, discusses your concerns and comes up with an action plan. I'm very grateful for choosing her upon the recommendations I received. I would recommend her to anyone who needs to see a gastro doctor, she really is fantastic.
Jeremy S.
Patient Testimonials

Blogs
IBS

Signs to Visit Your Doctor for IBS

Cramping, bloating, and unpredictable trips to the bathroom are common signs of irritable bowel syndrome (IBS). IBS is a long-term condition that affects how the large intestine works.

Read More »
November 9, 2026
Colonoscopy

How to Make Colonoscopy Prep Easier

For many people, the hardest part of a colonoscopy isn’t the procedure itself. It’s the bowel prep the day before. The good news is that colonoscopy prep has become easier

Read More »
October 12, 2026

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